Pneumatic rubbing-machine.



J. J. DIGKSON.

PNEUMATIC RUBBING MACHINE.

APPLICATION FILED MAR. 23, 1911.

Patented Feb. 13, 1912.

2 SEEETSSHEET 1.

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IV/T/VESSES:

A TTORNEJI J'. J. DIGKSON.

PNEUMATIC RUBBING MACHINE.

APPLICATION r1121) 1111:. 2a, 1911. ,Q] "j7,388 Patented Feb. 13,1912.

2 SHEETSBHBBT.2.

lV/TNESSES: INVENTOR.

44. M g! 4391 W A TTORNEY;

JEREMIAH J. DICKSON, OF INDIANAPOLIS, INDIANA.

PNEUMATIC RUBBING-MACHINE.

Application filed March 23, 1911. Serial No. 616,471.

reference marked thereon.

This invention relates to a portable machine adapted to be carried in the hands of a workman and to be operated by compressed air for rubbing or smoothing sur faces, and more especially rubbing and cleaning the faces of walls of buildings, es-' pecially such as are constructed wholly or in part of dressed stones.

The object ofthe invention is to provide a rubbing machine that will be adapted to be carried by hand to the work and operated by power at a considerable distance from the source of the power, a particular object being to provide anim roved rubbing or cleaning machine that Wlll be adapted to be carried by a workman on ladders or scaffolds, for cleaning the exterior of buildings and adapted to be operated through the means of an air compressing plant which may be located either in the building or on the ground; a still further object being to provide a machine of the above-mentioned character that may be constructed of relatively few parts and be'of light weight, so as to be easily carried and held to the work by an ordinary workman, and which will be adapted to do the work rapidly, efliciently and economically and without liability to become deranged in use.

The invention consists essentially in a frame including guides and an air cylinder connected rigidly together, a rubbing-head guided movably in the frame and connected to a piston rod which is attached to a piston operated in the cylinder, and a valve and operating mechanism therefor automatically controlling the admission of compressed air to the cylinder; and the invention consists further in the novel parts, and combinations and arrangements of parts,,as hereinafter particularly described and claimed. I

Referrin to the drawings, Figure 1 is an elevation o the improved rubbing machine in which portions are in section; Fig. 2, an inverted plan in which portions are in sec- Specification of Letters Patent.

Patented Feb. 13,1912.

t on; Fig 3, a fragmentary section on the l1ne' A A in Fig. 1; Fig. 4, a fragmentary sect onal elevation; Fig. 5, a fragmentary sectlon on the line B B in Fig. 4; Fig. 6, a fragmentary section on the line'C C in Fig. 3; Flg. 7, afragmentary section on the line D D in Fig. 4; Fig. 8, a transverse section on the line E E. in. Fig. 1; Fig. 9, a fragmentary section on the line F F in Fig. 1; Fig. 10, a fragmentary section on the line G G 1n Flg. 6; Fig. 11, an inverted plan view of the air controlling valve; and Fig; 12, a fragmentary view showing the plan of the valve seat and arrangement of ports therein.

Similar reference characters in the difchine is used on the face of a vertical wall.

The cylinderhas two ears 3 and 3' on opposite sides of the wall thereof to which rods 4 and 4 are secured, respectively, a head-bar 5 comprising a part of theframe being secured to the rods, so that the cylinder serves as a part of the frame. Two frame bars 6 and (5 are secured at one end to opposite ends of the frame-bar 5 and are adapted to constitute parallel guide-bars, the inner sides thereof preferably having guide grooves 7 and 7 therein, respectively. A tail-bar 8 is secured to the opposite ends of the frame-bars 6 and 6' and it has an open handle 9 on the outer side thereof, the handles 2 and 9 being adapted to be grasped by the workman for carrying and guiding the machine. A rubbing head 10 is provided which is adapted to be guided movably between the frame-bars 6 and 6, prefjustable jaw 15 is arranged on the rubbing I ing connected to the rub bing head. Any suitable instrument, such and is preferablycylindrical.

as a block of emery or corundum, or a block of wood covered with sand paper, or a steel brush or the like, ma be secured between the jaws 13 and 15; in the present case a block 18 being illustrated, and it is securely held not only by the jaws but also. by means of bolts 19 and 19 extending through the block and the two jaws, so that the block is firmly clamped in its place against the rubbing head.

The cylinder is provided with a head 20 on its end that is nearest to the frame-bar 5 and it has a recess 21 in the-inner side thereof, the outer side being provided with a suitable packing-nut 22 through which a piston-rod 23 extends, a suitable piston 24 being fitted into the cylinder and secured to the inner end of the piston-rod, the outer.

end of the piston-rod being secured to the boss 11 by means of the set screw 12. A coilspring 25 is seated in the recess 21 and extends inward beyond the inner side of the cylinder head, the spring encircling the piston-rod and adapted to gradually stop the piston 24 and prevent it from striking the cylinder head. The opposite or outer end of the cylinder is provided with a head 26 which has a cylindrical extension 27 on its outer side normally closed by a plug 28, and a coil-spring 29 is seated against the plug in the-extension and projects beyond the inner side of the cylinder head for stopping the piston 24 without jar. A flat valve-seat 30 is cast on the exterior of the wall of the cylinder 1, and a port 31 extends from the valve-seat through the wall of the cylinder and affords communication with the outer end port-ion of the cylinder, another port 32 extending from the valveseat tothe opposite end portion of the cylinder. A suitable valve chest 33 is secured to the marginal portion of the valve-seat A suitable disk-shaped valve 34 is provided which has two inlet ports 35 and 36 therein. The

' under side of the valve has an exhaust cavity 37 adapted to provide communication between the port 31 and an exhaust port 38 which extends from the valve seat through the wall of the cylinder to the atmosphere, or to establish communication between the port 32 and-the exhaust port. The valve has a central aperture 39 at the sides of which are recesses "40 and 40, and a'shaft 41 is rotatably mounted in the front of the valve-chest and extends through the aperture '39 and into a guide-socket 42 in the aoraese the shaft extending through the middle portion of the spring. An inlet pipe 46 is connected to the valve-chest and has a flexlble air-pipe or hose 47 connected thereto for supplying compressed air to the valvechest. The top of the valve 34 is provided with projections 48, 48, at opposite sides of the spring 45, adapted to move the spring with the valve. A hub 49 is secured to the outer end of the shaft 41 and has two arms 50 and 51 thereon, and the rotative movement of the shaft 41 preferably is limited by means of stops 52 and 53 upon the top of the valve-chest and in the path of movea boss 54 which has a pivot 55 thereon ro- I tatively mou nted in the arm, and a-valverod 56 1s sult-ably mounted in the boss so as to slide longitudinally therein, the valverod having an arm 57 thereon which extends through a suitable opening in the piston-rod 23, being rotatable therein, and is held in place by retaining pins 58 and 58 or otherwise as may be preferred. The valve-rod has a collar 59 thereon at one side of the boss 54 and another collar 60 at the opposite side of the boss, the collars being suitably spaced apart and secured to the rod preferably by means of set-screws 61 and 61, respectively, and preferably two coil-springs 62 and 62' are placed on the rod at opposite sides of the boss to prevent arring in operation. vided with a boss 63 which has a pivot 64 rotatively mounted in the arm. A guiderod 65 is suitably'secured to the boss and extends through a rotatable abutment 66 which is mounted against the exterior of the cylinder on a suitable pivotal stud 67 secured to the wall ofthe cylinder, and a The arm 51 is procoil-spring 68 is placed on the rod under compression in contact with the abutment and theboss 63, so as to hold the arm 51 against the stop 53 or to force the arm 50' against the stop 52.

It should be understood that the details of construction of the air operated engine may be variously modified as may be desired, and also various other modifications may be made within the scope of the appended claims. V

In practical use compressed air is admitted to the valve-chest and. the workman holds the machine in front of him against the wall that is to becleaned or smoothed, with a proper instrument held in the jaws 13' and 15 pressed by hand against the object tobe worked on, the engine operating automatically to move the rubbing head to and fro. If the work is.horizontal or at any other angle, it will be understood that the workman will carry the machine and hold it to the desired place. It should be understood also that a safety rope may be connected to the'handle 9 or elsewhere and to some part of the building, to catch the machine in case the workman accidentally falls or lets the machine fall from his hands, so that accidents maybe guarded against when working on buildings.

In the operation of the engine the valverod 56moves the arm 50 by means of the collars 59 and 60 until the ivot 64 crosses the plalnein which the sha t 41 and a'butment 66 are located, and then the spring 68 acts to move the shaft rotatively the required distance to open the port necessary to roduce reverse motion of the piston'24. Otlijer results will be readily understood from the description and functions of the details of construction of the engine.

The engine construction, illustrated and described as being advantageously connected with the rubbing machine proper, but not herein claimed, forms the subjectmatter of the claims in my co-pending a 4 plication for Letters Patent, filed May 1%, 1911, Serial Number 627,822. 7

Having thus described the invention, what is claimed as new, is-

1. A rubbing machine including a guide frame having two guide bars spaced apart,

- a rubbing head member movably mounted in contact with the two guide bars and having two opposing projecting jaws on one side thereof, 'means for rigidly securing a rubbing instrument between the two jaws to project beyond them, and means for moving the head member.

2. A rubbing machine including a guide frame having two guide bars s a-ced apart, a rubbing head member movably mounted in contact with the two guide bars and provided on one side thereof with adjustable clam ing devices for rigidly securing a rubbing instrument removably thereto, and

operating mechanism connected with the guide frame and the rubbing'head member. 3. A rubbing machine including a head 7 bar, a tail bar, two guide bars connected to the head bar and also to the tail bar, a rubbin head member mounted movably on the gui e bars and having a jaw fixed thereon, a jaw secured adj ustably to the rubbing head member, a bolt connectedwith the two jaws,

a rod connected to the rubbing head mem-.

ber, and means for moving the rod.

, 4. ,A rubbing machine mcluding a head bar, a tail bar, two guide bars connected to the head bar and also to the tail bar, a'rubbing head member mounted movably on the guide bars and having a jaw fixed thereon,

the member having also slots therein, a jaw' having a base flange adjustably seated on the head member, screws extendingthrough the slots and into the base flan e, bolts connected with the two jaws, an nected to the head member;

5. A pneumatic rubbing machine including a guide frame having ahandle thereon, a rubbing head movably mounted in the guide frame and having two opposing jaws, one of the jaws being adjustable relative to the other, means for forcing the adjustable jaw towardthe other one of the two jaws, an engine cylinder having a handle thereon, means securing the guide fram'egto a rod conthe cylinder, a piston 1n the cylinder, and

a piston-rod connected to the piston and also to the rubbing head.

6, A rubbing machme including a guide frame having two guide bars spaced apart, a rubbing head member movably mounted between the two guide bars in' contact therewith, the member having two opposing jawson one side thereof, one of the jaws being adjustable relative to the other, means for forcing the adjustable jaw toward the other one of the two jaws, and operating mechanism connected to one end portion of the guide frame and also to -the rubbing head member.

In testimony whereof, I aflix my 'signature in presence of two witnesses.

JEREMIAH J. DICKSON. Witnesses a P. A. HAVELICK, E. T. SILVIUS. 

